What's That Rock?Chalcopyrite
An important copper ore. It looks like brassy gold-yellow metal and often tarnishes to purple, blue and green.
Safety
Wash hands after handling raw pieces and avoid breathing dust.
How to identify Chalcopyrite
- Softer than pyrite: a knife can scratch it
- Iridescent purple-blue tarnish
- Greenish-black streak
Often confused with
Is Chalcopyrite valuable?
Inexpensive.
Typical retail prices
Collector specimen$15–120each
Typical retail ranges in US dollars, compiled from public dealer and marketplace listings in October 2026. Real prices vary widely with quality, size and origin. This is general information, not an appraisal.
What changes the price
- Crystals: sharp, shiny crystals on matrix cost more than massive lumps
- Iridescence: a strong rainbow tarnish makes pieces sought-after, but dyed or coated pieces exist
- Origin and size: complete, undamaged cabinet specimens are worth more
Uses
- Copper ore, collectors' specimens
Care
Keep dry; tarnish colors may change.
Identifying a stone from a description or a photo is an estimate. Many stones look alike. Ask an expert or a gem lab before you buy, sell or rely on an identification.
Updated October 2026